import torch
import torch.nn.functional as F
import torch.nn as nn
from torch.nn import Conv1d, ConvTranspose1d
from torch.nn.utils import weight_norm, remove_weight_norm

LRELU_SLOPE = 0.1


def init_weights(m, mean=0.0, std=0.01):
    classname = m.__class__.__name__
    if classname.find("Conv") != -1:
        m.weight.data.normal_(mean, std)


def get_padding(kernel_size, dilation=1):
    return int((kernel_size * dilation - dilation) / 2)


class ResBlock1(torch.nn.Module):
    def __init__(self, h, channels, kernel_size=3, dilation=(1, 3, 5)):
        super(ResBlock1, self).__init__()
        self.h = h
        self.convs1 = nn.ModuleList(
            [
                weight_norm(
                    Conv1d(
                        channels,
                        channels,
                        kernel_size,
                        1,
                        dilation=dilation[0],
                        padding=get_padding(kernel_size, dilation[0]),
                    )
                ),
                weight_norm(
                    Conv1d(
                        channels,
                        channels,
                        kernel_size,
                        1,
                        dilation=dilation[1],
                        padding=get_padding(kernel_size, dilation[1]),
                    )
                ),
                weight_norm(
                    Conv1d(
                        channels,
                        channels,
                        kernel_size,
                        1,
                        dilation=dilation[2],
                        padding=get_padding(kernel_size, dilation[2]),
                    )
                ),
            ]
        )
        self.convs1.apply(init_weights)

        self.convs2 = nn.ModuleList(
            [
                weight_norm(
                    Conv1d(
                        channels,
                        channels,
                        kernel_size,
                        1,
                        dilation=1,
                        padding=get_padding(kernel_size, 1),
                    )
                ),
                weight_norm(
                    Conv1d(
                        channels,
                        channels,
                        kernel_size,
                        1,
                        dilation=1,
                        padding=get_padding(kernel_size, 1),
                    )
                ),
                weight_norm(
                    Conv1d(
                        channels,
                        channels,
                        kernel_size,
                        1,
                        dilation=1,
                        padding=get_padding(kernel_size, 1),
                    )
                ),
            ]
        )
        self.convs2.apply(init_weights)

    def forward(self, x):
        for c1, c2 in zip(self.convs1, self.convs2):
            xt = F.leaky_relu(x, LRELU_SLOPE)
            xt = c1(xt)
            xt = F.leaky_relu(xt, LRELU_SLOPE)
            xt = c2(xt)
            x = xt + x
        return x

    def remove_weight_norm(self):
        for l in self.convs1:
            remove_weight_norm(l)
        for l in self.convs2:
            remove_weight_norm(l)


class ResBlock2(torch.nn.Module):
    def __init__(self, h, channels, kernel_size=3, dilation=(1, 3)):
        super(ResBlock2, self).__init__()
        self.h = h
        self.convs = nn.ModuleList(
            [
                weight_norm(
                    Conv1d(
                        channels,
                        channels,
                        kernel_size,
                        1,
                        dilation=dilation[0],
                        padding=get_padding(kernel_size, dilation[0]),
                    )
                ),
                weight_norm(
                    Conv1d(
                        channels,
                        channels,
                        kernel_size,
                        1,
                        dilation=dilation[1],
                        padding=get_padding(kernel_size, dilation[1]),
                    )
                ),
            ]
        )
        self.convs.apply(init_weights)

    def forward(self, x):
        for c in self.convs:
            xt = F.leaky_relu(x, LRELU_SLOPE)
            xt = c(xt)
            x = xt + x
        return x

    def remove_weight_norm(self):
        for l in self.convs:
            remove_weight_norm(l)


class Generator(torch.nn.Module):
    def __init__(self, h):
        super(Generator, self).__init__()
        self.h = h
        self.num_kernels = len(h.resblock_kernel_sizes)
        self.num_upsamples = len(h.upsample_rates)
        self.conv_pre = weight_norm(
            Conv1d(256, h.upsample_initial_channel, 7, 1, padding=3)
        )
        resblock = ResBlock1 if h.resblock == "1" else ResBlock2

        self.ups = nn.ModuleList()
        for i, (u, k) in enumerate(zip(h.upsample_rates, h.upsample_kernel_sizes)):
            self.ups.append(
                weight_norm(
                    ConvTranspose1d(
                        h.upsample_initial_channel // (2**i),
                        h.upsample_initial_channel // (2 ** (i + 1)),
                        u * 2,
                        u,
                        padding=u // 2 + u % 2,
                        output_padding=u % 2,
                    )
                )
            )

        self.resblocks = nn.ModuleList()
        for i in range(len(self.ups)):
            ch = h.upsample_initial_channel // (2 ** (i + 1))
            for j, (k, d) in enumerate(
                zip(h.resblock_kernel_sizes, h.resblock_dilation_sizes)
            ):
                self.resblocks.append(resblock(h, ch, k, d))

        self.conv_post = weight_norm(Conv1d(ch, 1, 7, 1, padding=3))
        self.ups.apply(init_weights)
        self.conv_post.apply(init_weights)

    def forward(self, x):
        # import ipdb; ipdb.set_trace()
        x = self.conv_pre(x)
        for i in range(self.num_upsamples):
            x = F.leaky_relu(x, LRELU_SLOPE)
            x = self.ups[i](x)
            xs = None
            for j in range(self.num_kernels):
                if xs is None:
                    xs = self.resblocks[i * self.num_kernels + j](x)
                else:
                    xs += self.resblocks[i * self.num_kernels + j](x)
            x = xs / self.num_kernels
        x = F.leaky_relu(x)
        x = self.conv_post(x)
        x = torch.tanh(x)

        return x

    def remove_weight_norm(self):
        # print('Removing weight norm...')
        for l in self.ups:
            remove_weight_norm(l)
        for l in self.resblocks:
            l.remove_weight_norm()
        remove_weight_norm(self.conv_pre)
        remove_weight_norm(self.conv_post)


##################################################################################################

# import torch
# import torch.nn as nn
# import torch.nn.functional as F
# from torch.nn import Conv1d, ConvTranspose1d
# from torch.nn.utils import weight_norm, remove_weight_norm

# LRELU_SLOPE = 0.1


# def init_weights(m, mean=0.0, std=0.01):
#     classname = m.__class__.__name__
#     if classname.find("Conv") != -1:
#         m.weight.data.normal_(mean, std)


# def get_padding(kernel_size, dilation=1):
#     return int((kernel_size * dilation - dilation) / 2)


# class ResBlock(torch.nn.Module):
#     def __init__(self, h, channels, kernel_size=3, dilation=(1, 3, 5)):
#         super(ResBlock, self).__init__()
#         self.h = h
#         self.convs1 = nn.ModuleList(
#             [
#                 weight_norm(
#                     Conv1d(
#                         channels,
#                         channels,
#                         kernel_size,
#                         1,
#                         dilation=dilation[0],
#                         padding=get_padding(kernel_size, dilation[0]),
#                     )
#                 ),
#                 weight_norm(
#                     Conv1d(
#                         channels,
#                         channels,
#                         kernel_size,
#                         1,
#                         dilation=dilation[1],
#                         padding=get_padding(kernel_size, dilation[1]),
#                     )
#                 ),
#                 weight_norm(
#                     Conv1d(
#                         channels,
#                         channels,
#                         kernel_size,
#                         1,
#                         dilation=dilation[2],
#                         padding=get_padding(kernel_size, dilation[2]),
#                     )
#                 ),
#             ]
#         )
#         self.convs1.apply(init_weights)

#         self.convs2 = nn.ModuleList(
#             [
#                 weight_norm(
#                     Conv1d(
#                         channels,
#                         channels,
#                         kernel_size,
#                         1,
#                         dilation=1,
#                         padding=get_padding(kernel_size, 1),
#                     )
#                 ),
#                 weight_norm(
#                     Conv1d(
#                         channels,
#                         channels,
#                         kernel_size,
#                         1,
#                         dilation=1,
#                         padding=get_padding(kernel_size, 1),
#                     )
#                 ),
#                 weight_norm(
#                     Conv1d(
#                         channels,
#                         channels,
#                         kernel_size,
#                         1,
#                         dilation=1,
#                         padding=get_padding(kernel_size, 1),
#                     )
#                 ),
#             ]
#         )
#         self.convs2.apply(init_weights)

#     def forward(self, x):
#         for c1, c2 in zip(self.convs1, self.convs2):
#             xt = F.leaky_relu(x, LRELU_SLOPE)
#             xt = c1(xt)
#             xt = F.leaky_relu(xt, LRELU_SLOPE)
#             xt = c2(xt)
#             x = xt + x
#         return x

#     def remove_weight_norm(self):
#         for l in self.convs1:
#             remove_weight_norm(l)
#         for l in self.convs2:
#             remove_weight_norm(l)

# class Generator(torch.nn.Module):
#     def __init__(self, h):
#         super(Generator, self).__init__()
#         self.h = h
#         self.num_kernels = len(h.resblock_kernel_sizes)
#         self.num_upsamples = len(h.upsample_rates)
#         self.conv_pre = weight_norm(
#             Conv1d(h.num_mels, h.upsample_initial_channel, 7, 1, padding=3)
#         )
#         resblock = ResBlock

#         self.ups = nn.ModuleList()
#         for i, (u, k) in enumerate(zip(h.upsample_rates, h.upsample_kernel_sizes)):
#             self.ups.append(
#                 weight_norm(
#                     ConvTranspose1d(
#                         h.upsample_initial_channel // (2**i),
#                         h.upsample_initial_channel // (2 ** (i + 1)),
#                         k,
#                         u,
#                         padding=(k - u) // 2,
#                     )
#                 )
#             )

#         self.resblocks = nn.ModuleList()
#         for i in range(len(self.ups)):
#             ch = h.upsample_initial_channel // (2 ** (i + 1))
#             for j, (k, d) in enumerate(
#                 zip(h.resblock_kernel_sizes, h.resblock_dilation_sizes)
#             ):
#                 self.resblocks.append(resblock(h, ch, k, d))

#         self.conv_post = weight_norm(Conv1d(ch, 1, 7, 1, padding=3))
#         self.ups.apply(init_weights)
#         self.conv_post.apply(init_weights)

#     def forward(self, x):
#         x = self.conv_pre(x)
#         for i in range(self.num_upsamples):
#             x = F.leaky_relu(x, LRELU_SLOPE)
#             x = self.ups[i](x)
#             xs = None
#             for j in range(self.num_kernels):
#                 if xs is None:
#                     xs = self.resblocks[i * self.num_kernels + j](x)
#                 else:
#                     xs += self.resblocks[i * self.num_kernels + j](x)
#             x = xs / self.num_kernels
#         x = F.leaky_relu(x)
#         x = self.conv_post(x)
#         x = torch.tanh(x)

#         return x

#     def remove_weight_norm(self):
#         print("Removing weight norm...")
#         for l in self.ups:
#             remove_weight_norm(l)
#         for l in self.resblocks:
#             l.remove_weight_norm()
#         remove_weight_norm(self.conv_pre)
#         remove_weight_norm(self.conv_post)
